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You can use @sln JSON Perl/PCRE regex functions to validate and error check.
See this link for several practical usagge examples to query and validate JSON,
and for a full explanation of the several functions available :
https://stackoverflow.com/a/79785886/15577665

json_regexp = paste0(
   "(?x)                                                            \n",
   "                                                                \n",
   " # JSON recursion functions by @sln                             \n",
   "                                                                \n",
   " (?:                                                            \n",
   "    (?:                # Valid JSON Object or Array             \n",
   "       (?&V_Obj)                                                \n",
   "     | (?&V_Ary)                                                \n",
   "    )                                                           \n",
   "  |                   # or,                                     \n",
   "    (?<Invalid>        # (1), Invalid JSON - Find the error     \n",
   "       (?&Er_Obj)                                               \n",
   "     | (?&Er_Ary)                                               \n",
   "    )                                                           \n",
   " )                                                              \n",
   " \n",
   " \n",   
   " (?(DEFINE)(?<Sep_Ary>\s*(?:,(?!\s*[}\]])|(?=\])))(?<Sep_Obj>\s*(?:,(?!\s*[}\]])|(?=})))(?<Er_Obj>(?>{(?:\s*(?&Str)(?:\s*:(?:\s*(?:(?&Er_Value)|(?<Er_Ary>\[(?:\s*(?:(?&Er_Value)|(?&Er_Ary)|(?&Er_Obj))(?:(?&Sep_Ary)|(*ACCEPT)))*(?:\s*\]|(*ACCEPT)))|(?&Er_Obj))(?:(?&Sep_Obj)|(*ACCEPT))|(*ACCEPT))|(*ACCEPT)))*(?:\s*}|(*ACCEPT))))(?<Er_Value>(?>(?&Numb)|(?>true|false|null)|(?&Str)))(?<Str>(?>"[^\\"]*(?:\\[\s\S][^\\"]*)*"))(?<Numb>(?>[+-]?(?:\d+(?:\.\d*)?|\.\d+)(?:[eE][+-]?\d+)?|(?:[eE][+-]?\d+)))(?<V_KeyVal>(?>\s*(?&Str)\s*:\s*(?&V_Value)\s*))(?<V_Value>(?>(?&Numb)|(?>true|false|null)|(?&Str)|(?&V_Obj)|(?&V_Ary)))(?<V_Ary>\[(?>\s*(?&V_Value)(?&Sep_Ary))*\s*\])(?<V_Obj>{(?>(?&V_KeyVal)(?&Sep_Obj))*\s*})) \n"
)

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Posted by: sln

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